This Standard establishes performance requirements for bored residential locksets and latches@ and includes durability@ security@ finish tests. Residential locksets and latches are generally used for single family homes and multifamily dwellings. Tests described in this Standard are performed under laboratory conditions. In actual usage@ results vary because of installation@ door and frame construction@ maintenance and environmental conditions. When locks and latches are used in fire door assemblies@ they shall have been tested and listed for use in fire doors by a Nationally Recognized Testing Laboratory (NRTL) and shall be under an inplant follow-up inspection service. Residential Grade Qualifications Manufacturers shall indicate the Grade level of their locks for each of the three categories listed (Durability@ Strength and Security@ and Finish). Locks shall meet all tests for their grade listing for each of the categories independently. A Grade A lock for a specific category shall meet all Grade A criteria for that category@ and a Grade B lock for a specific category shall meet all Grade B criteria for that category@ and a Grade C lock for a specific category shall meet all Grade C criteria for that category.